Pump.



C. R. GREEN.

PUMP.

APPLICATION FILED 313.20, 1908.

Patented Oct. 26, 1909.

2 SHEETS-SHEET 1.

20 INVENTOR.

-- WITNESSES;

0. EL GREEN.

PUMP. I APPLIUA ION FILED I'HB. 20,1908.

Patented Oct. 26, 1909 2 snnn'rs-snnr 2 IN VEN TOR. mgww A TTORN E Y;

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vation of same.

UNITED STATES rArENT OFFICE.

CARL R. GREEN, OF DAYTON, OHIO, ASSIGNOR TO THE NATIONAL VACUUM CLEANING I COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

PUMP.

cameo.

To all whom it may concern:

Be it known that I, CARL R. GREEN, a citizen of the United States, residing at Dayton, in the county of Montgomery and State 'of Ohio, have invented certain new and useful Improvements in Pumps, of which the following is a specification. v

My invention relates to pumps and particularly ho air or vacuum pumps for use in vacuum cleaning systems.

The object of the invention is to greatly simplify the structure as well as the means and mode of operation of such devices whereby they will not only be chea ened in construct-ion, but will be more efiicient and positive in operation, more easily operated, and unlikely to get out of repair.

With the above primary and other incidental objects in view as will more fully ap pear from the specification, the invention consists of the means, mechanism, parts, construction, or their equivalents, and the mode of operation hereinafter described and set forth in the claims.

In the drawings Figure 1 is a plan view of an assembled double cylinder pump, embodying the invention. Fig. 2 is a side ele- Fig. 3 is a vertical seetiona'l View through the cylinder and valve chamber. Fi .4 is a side elevation of a portion of one OI the cylinders. Figs. 5 and 6 are detail transverse sectional views through the valve and valve chamber showing the relationof the inlet and outlet ports. Fig. 7 is a detail perspect-ive'view of the rotary valve. v v

Like parts are indicated by similar characters of reference throughout the several views.

In the drawings the pump. is illustrated as being of the double cylinder type, but it is to be understood that the-construction of each cylinder and operating mechanism is the same, and that the same constructions hereinafter described may be used in a single cylinder pump. 4

In constructing the device "there is employed a base 1, said base having bearings therein for the usual crank shaft 2. Mount- I 50 -ed on the base 1 is one or more cylinders 3,

according to the desired capacity of the machine. In each of the cylinders is located a reciprocating piston 4 of ordinary construction, perated from the crank shaft 2 inthe usual manner.

Specification of Letters Patent,

Application filed February 20, 1908. Serial No. 416,855.

Secured to each. of the cylinders 3 is a cylinder head 5, having formed therein a cylindrical valve chamber 6. An inlet port 7 and an outlet port 8 form a means of communication between the interior of the cyl-' inder 3 and the valve chamber 6, said ports extendin through the cylinder head 5 at either si eof the medial line of the cylinder. Connected to opposite ends of the valve chamber 6, isan inlet elbow member 9 connecting with the intake conduit, and an outlet elbow member 10, forming a discharge orifice.

- Revolubly mounted within the valve chamber 6 is a hollow cylindrical valve 11, divided into an intake compartment'lQ and an outlet compartment 13 by a central wall or septum 14.

In each of the inlet andoutl'et compartments 12 and 13 are openings or ports 15 and 16 respectively, registering with the respective inlet and outlet ports 7 and 8 in the cylinder head 5. The ports 15 and 16 are so located in the valve 11 as to be brought alternately into registry with the ports 7 and 8 upon the continued rotation of the valve 11 within the chamber 6.'

The relative positions of 'the ports 15 and 16 are shown in Figs. 5 and .(3, which are transverse sectional views through the valve and valve chamber, taken through the respective ports, the valve being rotated in the direction indicated by the arrows. It will be noticed that as positioned in the said closed, the outlet having beencut off while the inlet is approaching open position. This is the position of the valves as the piston 4 begins its return or intake stroke.

Then the piston 4 reaches the lower or inner intake limit of its stroke, the air -Within the cylinder will be below atmospheric pressure, and ifthe outlet port was open at this time theair would rush into thecylinder through said outlet 0 )ening. H owever the relative location. 0 the \and 16 in the valve 11 is such that t 1e outlet port is not 0 ened until the piston 4 has traveled a su icient distance on its return stroke to compress the air in the cylinder to atmospheric pressure, at which time the 'outlet port will open and remain so throughout the remainder of the stroke. Whenthe piston 4 has reached the limit of its-upward or expelling stroke, the outlet Walve will be views bbth 'the inletand outlet ports are orts 15 with the crank shaft 2.

To drive the. valve 11 a shaft 17 is provided, which projects laterally through the outlet elbow member 10, and carries a sprocket wheel 18 driven by a chain 19 from a similar sprocket 20 on the crank shaft 2. It is obvious that other equivalent means as pulleys and belts or bevel gears might be employed for driving the valve, or a crank and pitman connection between the crank shaft and. valve might be used, but the construction illustrated in the drawing is the preferable device. The valve shaft 17 is shown as attached to the wall or septum 14 of the valve, however it is obvious that a head or spider might be formed at the eX- tremity of the valve to form a connection for said shaft 17.

Supported on the member 10 is pendent portion 21 having a slot 22 therein in which is adjustably secured an idler pulley 23 bearing on the drive chain 19 and by its adjustment serving to takeup the slack in said chain.

In mounting the cylinders in duplicate the heads 5 are preferably located thereon in reverse order, as shown in Fig. 1 to economlze space. In this position the respective valve chambers and the r connections to the intake conduit will overlap, or extend past the central line of the structure, in which combination the mean ends of the respective valves will be the intake ends, and the extremeends will be the outlets,

The inlet elbowsmembers 9 are connected by a Y member 24 forming the terminal of the intake conduit, which is connected to the Y member at 25. Thus a common intake conduit will be employed for both cylinders of the combination, the Y member- 25 occupying a diagonal position, due to the overlapping ends of the valve chamber as before mentioned.

This arrangement of parts will result in a very compact structure, which is very desirable in machinesof the type described.-

From the above description it will be apparent that there is thus produced a machine of he character described, which possesses the particular features or. adva'nta e before enumerated as desirable, but which obvious'ly is susceptible ofmodificationin its form proportion,

detail construction, and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

rotating in one iwith the ports of, and a supply Having thus scribed my invention I claim,

1. In a single acting vacuum pump, :1, cylinder, a reciprocating piston therein, acylinder head having an integral chamber formed therein, two ports in the cylinder.

mans of communication beand said chamber in the head formin tween the cy inde cylinder head, a v lve direction mounted in the cylinder head chamber,

prising a tubular body open at opposite ends member continuously said valve member com;

and having a transverse wall or selptum lo cated therein dividing said tubu ar bodyt into two compartments, ports in the walls of the respective compartments-of the valve member, said ports being located in unalined relation and adaptedto alternately register in the cylinder head upon rotation of the valve member, and means to rotate said valve meniber,'substantially as specified. 2. In a machine of the character described,

' a c linder, a reciprocating piston therein, a

cylinder head having a single inlet and a single outlet port therein, a valve chamber mounted on the cylinderhead, a continuously rotating tubular Ivalve member mounted in said chamber, said valve member being divided into a supply compartment and an exhaust compartment, a single port in each ofdsaid compartments adapted to register with the corresponding inlet and outlet ports of the cylinder head at different points in the rotation of said valve member, sub stantially as specified.

3. In a double vacuum pum two cylinders arranged side cipr'ocating piston in each a continuous rotating valve member for each of said cylinders controllingthe inlet and outlet ports thereof, said valve members having an. intake orifice in one end thereof and a discharge orificein the opposite end there.- ;of the said valve members being so mounted as described,

y side, a re I of said cylinders,

on the c linders, that the dischargeorifices will be coated at the extreme ends of the respective valve members and the inlet orifices will be located at the mean ends therevalve members, su staritially as specified.-

In testimony whereof, I have hereunto set my hand this 10th day of February A, D.-

F- If. WALKER.

ipe common to both said 

